Journal of Experimental Botany最新文献_第5页

Nitro-oxidative nucleotide modifications in plants and associated microorganisms- signaling sensors or stress symptoms? 植物和相关微生物中的硝基氧化核苷酸修饰——信号传感器还是应激症状？

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf188

Jagna Chmielowska-Bąk, Ewa Sobieszczuk-Nowicka, Magdalena Arasimowicz-Jelonek

引用次数: 0

Integrated photosynthesis during fluctuating irradiance is correlated with steady-state photosynthesis for rice grown in field environments with elevated CO2 and temperature. 在CO2和温度升高的田间环境下，水稻在波动辐照下的综合光合作用与稳态光合作用相关。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf179

Chuang Cai, Xinyou Yin, Lian Song, Wei Zhou, Xinyue Gu, Xiong Yang, Xin-Guang Zhu, Chunwu Zhu

{"title":"Integrated photosynthesis during fluctuating irradiance is correlated with steady-state photosynthesis for rice grown in field environments with elevated CO2 and temperature.","authors":"Chuang Cai, Xinyou Yin, Lian Song, Wei Zhou, Xinyue Gu, Xiong Yang, Xin-Guang Zhu, Chunwu Zhu","doi":"10.1093/jxb/eraf179","DOIUrl":"https://doi.org/10.1093/jxb/eraf179","url":null,"abstract":"Photosynthesis under fluctuating irradiance is understudied, especially with regard to its response to elevated CO2 and temperature in field environments. We measured photosynthesis after a single-step irradiance change and during series of lightflecks for rice (Oryza sativa L.) grown under combinations of two CO2 levels (ambient and elevated by 200 μmol mol-1) and two temperature levels (ambient and increased by 2.0 °C) in temperature by free-air CO2 enrichment systems in two years. The cumulative CO2 fixation (CCF) during a single-step irradiance increase and during lightflecks were linearly correlated with final steady-state photosynthesis at the high irradiance (Anf) under elevated CO2 and temperature in both years. Across developmental stages, responses of CCF during a single-step irradiance increase and during lightflecks to elevated growth CO2, to elevated growth temperature, to elevated measurement CO2, and to elevated measurement temperature, were all in the same magnitude as responses of Anf to these variables. Lightfleck utilization efficiency (LfUE), defined as the ratio of CCF to assimilation expected from equivalent steady-state irradiance levels, showed large variation among lightfleck serial number, and this was related to the variation of stomatal conductance (gs) among the serial number. Thus, steady-state photosynthesis models may not result in critical errors in predicting the effects of elevated CO2 and temperature on dynamic photosynthesis provided that gs in responses to fluctuating irradiance can be quantified reliably.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Declining growth and changes in biomass allocation with warming in rainforest trees from temperate to tropical climates. 从温带到热带气候的雨林树木生长下降和生物量分配的变化。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf186

Z Choury, Y Olaranont, E Dando, B E Medlyn, M G Tjoelker, K Y Crous

{"title":"Declining growth and changes in biomass allocation with warming in rainforest trees from temperate to tropical climates.","authors":"Z Choury, Y Olaranont, E Dando, B E Medlyn, M G Tjoelker, K Y Crous","doi":"10.1093/jxb/eraf186","DOIUrl":"https://doi.org/10.1093/jxb/eraf186","url":null,"abstract":"Australian rainforests occur from temperate to tropical latitudes, but how climate warming will affect tree growth along this climate gradient remains poorly understood. We examined how changes in biomass allocation, leaf area, and photosynthetic capacity were linked to the capacity of these species to maintain growth rates with +3.5°, +7° and +10.5°C warming in seedlings of tropical, subtropical and temperate rainforest trees. Temperate species maintained or increased final biomass (+14%), leaf area (LA) and leaf area ratio (LAR, the ratio of leaf area to plant dry mass) with warming along with similar or increased leaf mass fraction (+14%). Subtropical species increased biomass with +3.5° (+28%) and +7 °C (+17%) warming but were negatively impacted with >10 °C warming (-31%). Tropical species reduced LA, LAR, photosynthetic capacity and leaf nitrogen, along with 14% increased root allocation in response to warming, resulting in large biomass reductions with +3.5 °C (-20%) and +7 °C (-53%). Tropical species were more susceptible to climate warming with reduced photosynthetic capacity and reduced biomass which can lead to a reduced carbon sink in the future, especially in late-successional tree species which are the most abundant with a large role in carbon assimilation of tropical rainforests.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144005379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CitACOS5 is crucial for male fertility in citrus by influencing pollen exine formation. CitACOS5通过影响花粉外皮的形成，对柑桔雄性育性起着至关重要的作用。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf181

Yan-Jie Fan, Feng-Quan Tan, Xing-Yi He, Zi-Ang Liu, Hui-Zhong Bai, Nan Jiang, Hui-Hui Jia, Wen-Hui Yang, Xin Song, Miao Zhang, Kai-Dong Xie, Wen-Wu Guo, Xiao-Meng Wu

{"title":"CitACOS5 is crucial for male fertility in citrus by influencing pollen exine formation.","authors":"Yan-Jie Fan, Feng-Quan Tan, Xing-Yi He, Zi-Ang Liu, Hui-Zhong Bai, Nan Jiang, Hui-Hui Jia, Wen-Hui Yang, Xin Song, Miao Zhang, Kai-Dong Xie, Wen-Wu Guo, Xiao-Meng Wu","doi":"10.1093/jxb/eraf181","DOIUrl":"https://doi.org/10.1093/jxb/eraf181","url":null,"abstract":"Male sterility (MS) holds great potential and value for breeding seedless cultivars of fruit trees. However, functional characterization of MS-related genes has been difficult in perennial fruit crops, because of extended juvenile period and difficulties in genetic transformation. In this study, we compared anther development of 'Qianyang Seedless' (QS), a natural seedless bud sport (somatic mutation) of Ponkan mandarin (Citrus reticulata Blanco) with a stable MS phenotype, with that of the seedy wild-type 'Egan NO.1' (EG). We observed significant abnormalities in QS at the microspore mother cell (MMC) stage, leading to the generation of abnormal tetrads and nonviable pollen. The transcriptomic analysis of anthers at the MMC stage showed a significant downregulation of the sporopollenin biosynthesis pathway genes in QS. Among them, CitACOS5 was pronouncedly downregulated in QS. The CRISPR/Cas9 mutants in Mini-citrus, cr-acos5, exhibited complete MS phenotypes, characterized by the absence of pollen grains due to defects in pollen wall formation and tapetum degradation. Biochemical assays validated that CitMYB80 directly bound to the promoter of CitACOS5 and activated its expression. Our results suggest that CitACOS5 is crucial for male fertility in citrus by influencing pollen exine formation, which offers potential target genes for seedless citrus breeding.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143996087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mobile RNAs and proteins: Impact on plant growth and productivity. 移动rna和蛋白质：对植物生长和生产力的影响。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf185

Kirtikumar R Kondhare, Amey J Bhide, Anjan K Banerjee

{"title":"Mobile RNAs and proteins: Impact on plant growth and productivity.","authors":"Kirtikumar R Kondhare, Amey J Bhide, Anjan K Banerjee","doi":"10.1093/jxb/eraf185","DOIUrl":"https://doi.org/10.1093/jxb/eraf185","url":null,"abstract":"Short- and long-distance mobile signals (mobile RNAs and proteins) are integral parts of the local and systemic communications that coordinate various physiological processes at whole plant level and have far-reaching impacts on plant productivity. A coherent description highlighting integral roles of these mobile signals in controlling phenotypic traits and plant productivity would be invaluable. Here, we emphasize how key mobile RNAs (mRNAs, small RNAs, and long non-coding RNAs) and proteins including RNA-binding proteins function as vital regulators of multi-faceted aspects of phenotypic traits, such as formation of shoot-apical meristem, leaf morphology, root architecture, flowering, ripening of fleshy fruits, tuberization, crop yield, and abiotic stress responses, that eventually govern plant productivity. We also describe recent advancements in macromolecular transport mechanisms, such as cyclophilin-mediated transport and extracellular vesicle-based signal delivery, as well as the identification of novel signature motifs on mobile RNAs. Further, we highlight the perspectives on discoveries of new mobile signals and underline how mobile signals could be explored with advanced biotechnological interventions, virus-induced flowering, genome-editing tools, and emerging breeding approaches (e.g. xenia-based mobile RNA delivery system for fleshy fruits) to design strategies for enhancing valuable phenotypic traits and plant productivity.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144023405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The role of auxin-mediated gene activation in the bryophyte, Physcomitrium patens. 生长素介导的基因激活在苔藓植物中所起的作用。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf183

Carlisle Bascom, Daniella Tu, Shreya Repakula, Michael J Prigge, Mark Estelle

{"title":"The role of auxin-mediated gene activation in the bryophyte, Physcomitrium patens.","authors":"Carlisle Bascom, Daniella Tu, Shreya Repakula, Michael J Prigge, Mark Estelle","doi":"10.1093/jxb/eraf183","DOIUrl":"https://doi.org/10.1093/jxb/eraf183","url":null,"abstract":"Perception and response to the hormone auxin is critical to plant growth and development. Expression of auxin-response genes is tightly regulated via known mechanisms of both activation and repression. Across the plant lineage, auxin-response gene induction is performed by AUXIN-REPSONSE FACTOR (ARF) activating transcription factors. Conversely, AUXIN/INDOLE ACETIC ACID proteins repress expression. Studies of gain-of-function constitutive-repression lines and ARF loss-of-function mutants have advanced the field. Yet, there is a need for a comparative study of aberrant auxin-signaling mutants to understand the developmental consequences of constitutive repression versus the absence of auxin-mediated gene induction. Using CRISPR/Cas9 gene-editing tools, we mutated each activating ARF gene in the model bryophyte, Physcomitrium patens. The resulting septuple loss-of-function mutant line (arfasept) has severe developmental phenotypes and a diminished ability to respond to exogenous auxin. However, phenotypic analysis revealed that the arfasept line is not as severely affected as the constitutive-repression lines. Expression analysis of several auxin-response genes demonstrate that auxin-mediated gene induction is abolished in both arfasept and constitutive-repression lines but that basal expression levels are higher in the arfasept lines. Our results suggest that the expression of auxin-regulated genes important for developmental progression is maintained, albeit at reduced levels, in the absence of ARFs.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143974268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Linking pod-set and seed yield of faba bean across organ, phytomer, plant and population scales. 蚕豆在器官、植物体、植株和群体尺度上的结荚和产量联系。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-04 DOI: 10.1093/jxb/eraf176

James B Manson, Matthew D Denton, Lachlan Lake, Jason Brand, Victor O Sadras

{"title":"Linking pod-set and seed yield of faba bean across organ, phytomer, plant and population scales.","authors":"James B Manson, Matthew D Denton, Lachlan Lake, Jason Brand, Victor O Sadras","doi":"10.1093/jxb/eraf176","DOIUrl":"https://doi.org/10.1093/jxb/eraf176","url":null,"abstract":"Pod-set is the conversion of flowers to pods but its connection to crop yield of pulses must traverse scales of biological organisation; here we address scaling from organ to crop in faba bean. Our main hypothesis was that resources drive pod-set and crop yield of faba bean, whereas allocation to pods or between pods plays a minor role. We combined new field experiments and published data to test supporting hypotheses organised in four studies. We found that pod-set is organised at the whole plant scale, not individual node scale, and associates with crop growth, not supposed competition between pods. Indeterminacy facilitates resource capture and yield, and, surprisingly, fruit removal could increase yield by up to 49 % when it allows continued growth and resource capture. Seed number, seed size and pod wall mass had yield-neutral trade-offs in our data. Crop yield and pods per m2 are associated with growth at the population, not plant, scale. We concluded that pod-set is dependent on crop growth but could be targeted for its feedback to post-flowering phenology and growth of plants. Our work provides conceptual links between plant reproductive biology and crop yield that could be relevant to other indeterminate crop species.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143995818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen nutrition impacts grapevine esca leaf symptom incidence, physiology and metabolism. 氮营养对葡萄叶片症状发生、生理和代谢的影响。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-03 DOI: 10.1093/jxb/eraf172

Ninon Dell'acqua, Gregory A Gambetta, Gwenaëlle Comont, Nathalie Ferrer, Adam Rochepeau, Pierre Pétriacq, Chloé E L Delmas

{"title":"Nitrogen nutrition impacts grapevine esca leaf symptom incidence, physiology and metabolism.","authors":"Ninon Dell'acqua, Gregory A Gambetta, Gwenaëlle Comont, Nathalie Ferrer, Adam Rochepeau, Pierre Pétriacq, Chloé E L Delmas","doi":"10.1093/jxb/eraf172","DOIUrl":"https://doi.org/10.1093/jxb/eraf172","url":null,"abstract":"Nitrogen plays a crucial role in plant growth and defence mechanisms, yet its role in plant-pathogen interactions is complex and remains largely unexplored, especially in perennial crops. This study aimed to investigate the effects of controlled nitrogen nutrition levels on disease incidence, fungal communities, and plant physiology and metabolism. Esca is a widespread grapevine vascular disease affecting physiology, xylem integrity and metabolism. Naturally infected Vitis vinifera L. cv. Sauvignon blanc were subjected to three ammonium nitrate treatments across three seasons, resulting in reduced esca incidence under nitrogen deficiency compared with medium nutrition levels, while excess nitrogen had no significant impact. Nitrogen treatments significantly impacted vine physiology and leaf metabolites but did not affect fungal wood communities. Nitrogen deficiency significantly reduced stem diameter, photosynthesis, and leaf area, likely decreasing whole-plant transpiration, while excess nitrogen increased these factors suggesting a key role of plant transpiration in esca incidence. Additionally, nitrogen deficiency led to significantly higher production of phenylpropanoids, particularly flavonoids, in leaf metabolomes compared to the medium level. These findings highlight the pivotal role of nitrogen in the development of esca through alterations in vine morphology, physiology and metabolism. Fertilization practices may be crucial in the management of plant diseases.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144003593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Balance of chlorophyll synthesis and thylakoid protein quality control influences chloroplast development in var2. 叶绿素合成平衡和类囊体蛋白质量控制影响var2叶绿体发育。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-03 DOI: 10.1093/jxb/eraf177

Peiyi Wang, Lin Zhu, Xiaomin Wang, Yanan Zhai, Jiahui Zhong, Hongchang Zhang, Jingxia Shao, Xiayan Liu, Fei Yu, Yafei Qi

{"title":"Balance of chlorophyll synthesis and thylakoid protein quality control influences chloroplast development in var2.","authors":"Peiyi Wang, Lin Zhu, Xiaomin Wang, Yanan Zhai, Jiahui Zhong, Hongchang Zhang, Jingxia Shao, Xiayan Liu, Fei Yu, Yafei Qi","doi":"10.1093/jxb/eraf177","DOIUrl":"https://doi.org/10.1093/jxb/eraf177","url":null,"abstract":"Filamentous temperature-sensitive H (FtsH) is one major protease for thylakoid protein quality control in photosynthetic organisms. Mutations of the AtFtsH2 subunit in Arabidopsis result in yellow variegated2 (var2) mutants. Genetic screening of ENHANCER OF VARIEGATION loci (EVR) provides new insights into the role of FtsH in chloroplast development beyond the degradation of photodamaged D1 protein. Here, we uncover a novel function of EVR3, previously reported as ETHYLENE-DEPENDENT GRAVITROPISM-DEFICIENT AND YELLOW-GREEN1 (EGY1), in regulating chlorophyll biosynthesis by association with the H subunit of magnesium chelatase (CHLH). Additionally, we identify a new var2 enhancer mutant, evr4-1, caused by a missense mutation in CHLH. The evr4-1 mutant shows a significant decline in accumulations of light-harvesting complexes (LHC) rather than in photosystem II core proteins, while evr3 evr4 double mutants exhibit synthetic lethal phenotypes accompanied by a drastic reduction in the accumulation of chlorophyll and LHC. Furthermore, disruption of the thylakoid protein sorting pathway mediated by the chloroplast Signal Recognition Particle 54kDa protein (cpSRP54) mitigates the chloroplast development defect in var2-4 evr4-1. Our findings underscore the critical role of thylakoid FtsH for thylakoid protein quality control when chlorophyll biosynthesis is disrupted.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143982671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diversity in the Rubisco temperature response kinetics and photosynthesis among four linted cotton (Gossypium) species. 四种棉种Rubisco温度响应动力学和光合作用的多样性。

IF 5.6 2区生物学

Journal of Experimental Botany Pub Date : 2025-05-03 DOI: 10.1093/jxb/eraf178

Demi Sargent, Spencer M Whitney, Katrina Broughton, Susan Y Jaconis, David Tissue, Michael Bange, Warren Conaty, Robert E Sharwood

{"title":"Diversity in the Rubisco temperature response kinetics and photosynthesis among four linted cotton (Gossypium) species.","authors":"Demi Sargent, Spencer M Whitney, Katrina Broughton, Susan Y Jaconis, David Tissue, Michael Bange, Warren Conaty, Robert E Sharwood","doi":"10.1093/jxb/eraf178","DOIUrl":"https://doi.org/10.1093/jxb/eraf178","url":null,"abstract":"There is increasing urgency for more productive and resource-use efficient crops to cope with changing climates. One possibility to improve crop productivity is to enhance photosynthesis. Here, we studied four linted cotton species, (Gossypium hirsutum, G. barbadense, G. arboreum and G. herbaceum), for diversity in the temperature response of Rubisco catalysis and impact on carbon assimilation. Compared with the model C3-plant tobacco, each cotton Rubisco had a slower carboxylation rate (kcatc) and higher CO2-affinity (lower Kc21%O2) in response to temperature, with the specificity for CO2 over O2 (Sc/o) of G. hirsutum Rubisco being thermally advantaged above 20°C relative to tobacco. Consistent with high homology between the cotton species Rubisco large subunits, there was little difference in the response of kcatc or Kc21%O2 to temperature. However, at temperatures above 15°C the carboxylation efficiency (kcatc/ Kc21%O2) of G. herbaceum Rubisco significantly exceeded G. hirsutum Rubisco by 23-29%, with the G. herbaceum enzyme predicted to support 20% higher rates of photosynthesis than tobacco Rubisco at 35°C. Leaf-level photosynthetic measurements at 28°C however showed no significant variation in the net photosynthetic CO2 assimilation rates, stomatal conductance, transpiration rate, intrinsic water-use efficiency, or photosynthetic electron transport rates between each cotton species. Using the 'OptiFitACi' A/Ci model parameterised with cotton Rubisco and mesophyll conductance (gm) values, the maximum Rubisco carboxylase activity (Vcmax) was 20% lower in G. herbaceum leaves compared to G. hirsutum. However, the greater Rubisco kinetics of G. herbaceum did not confer higher leaf photosynthesis.","PeriodicalId":15820,"journal":{"name":"Journal of Experimental Botany","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143968782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0